For me it all depends on the rep range. High rep I do touch and go cause I feel I can control the weight but like to push out reps as fast as I can to gain "snap up" power. But when I do touch and go I just barely touch the weight to the ground. On low reps I do stop and go though, to me it's to dangerous to try and pop right back up.

As someone always interested in limit strength or hypertrophy with respect to strength progression, I reset each rep. By doing so I always have to work my starting strength, something that's not developed with touch-and-go, and I don't rely on reversal strength as much, an aspect of strength that has no significant, direct role in pushing the deadlift max via deadlifting for reps. I and others have also found no carryover in touch-and-go styled deadlifts, so I don't use them as such. You'll notice progress with any pull variation will always be easier even with rep work if you reset between reps.

One might consider a scenario where you do a heavy set to try to push your strength up followed by a lighter set to increase TUT. I can see the merit in touch-and-go on the lighter set to maintain a sustained TUT; but of course all those reps in the reset-styled pulls also add up for a lot of TUT.